Australia's highest court has struck a blow to a police officer's bid to argue he acted in "good faith" in the alleged murder of a Warlpiri man.
Prosecutors successfully challenged the key tenet of Constable Zachary Rolfe's defence in his pending trial for the alleged murder of 19-year-old Kumanjayi Walker.
Mr Walker was shot while being arrested in the Northern Territory community of Yuendumu in November 2019.
The full bench of the High Court on Wednesday ruled in favour of prosecutors challenging Rolfe's reliance on an immunity clause contained in the territory's Police Administration Act.
This provides a protection from prosecution for actions performed in "good faith" during the exercise of police power.
Prosecutor Philip Strickland SC earlier argued a liberal construction of the clause risked leaving citizens vulnerable to police abuse or excess.
Acting for Rolfe, Bret Walker SC maintained the prosecutor's special leave to appeal part of the officer's defence was unnecessary.
Rolfe's trial has been pushed back multiple times, most recently in September when the Northern Territory judge overseeing it announced his retirement.
In August, the High Court agreed to a stay of proceedings pending the determination of Rolfe's defence.
